Eating Healthy

This paper contains 2 sections.

I) Answer ALL questions in section A and B (Q.4(e)) on the Answer Sheet.

(II) Answer other questions on single-lined papers.

All numerical answers should either be exact or corrected to 3 significant figures.

Section A Multiple-choice questions (34 marks)

1 The following graph shows the temperature change at the Peak on 16th July, 2009.

(Source: Hong Kong Observatory)

Which of the following statements about the temperature change on this day at the Peak is/are correct?

(1) The hottest time is at 2 pm.

(2) The temperature difference in the whole day is less than 5 (C.

(3) After 8 am, the temperature always increases until noon.

A. (1) only B. (2) only C. (1) and (2) only D. (1) and (3) only

2 The following graphs show how the volumes of four liquids change with temperature. The scales used in the graphs are the same. Which liquid is the most suitable to be used in a liquid-in-glass thermometer?

|A |B |

|[pic] |[pic] |

|C |D |

|[pic] |[pic] |

3 Which of the following statements about 0 (C are correct?

(1) It is the lower fixed point of the Celsius temperature scale.

(2) It represents the hotness of pure melting ice at normal atmospheric pressure.

(3) It is the temperature at which the average kinetic energy of the particles in an object is zero.

A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. All of the above

4 Which of the following combination(s) of thermometers and their...